Drafting. designating a method of projection (cabinet projection) in which a three-dimensional object is represented by a drawing (cabinet drawing) having all vertical and horizontal lines drawn to exact scale, with oblique lines reduced to about half scale so as to offset the appearance of distortion.

(modifier) suitable in size, value, decoration, etc, for a display cabinet: a cabinet edition of Shakespeare

8.

(modifier) (of a drawing or projection of a three-dimensional object) constructed with true horizontal and vertical representation of scale but with oblique distances reduced to about half scale to avoid the appearance of distortion

Meaning "case for safe-keeping" (of papers, liquor, etc.) is from 1540s, gradually shading to mean a piece of furniture that does this. Sense of "private room where advisors meet" (c.1600) led to modern political meaning (1640s); perhaps originally short for cabinet council (1630s); cf. board (n.1) in its evolution from place where some group meets to the word for the group that meets there.

cabinet definition

A select group of officials who advise the head of government. In nations governed by parliaments, such as Britain, the members of the cabinet typically have seats in parliament. (Comparecabinetunder “American Politics.”)